<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			input{background-color: black;}
			.a{font-size: xx-large;}
			#a{border-style:solid;border-color: aquamarine;border-radius: 10px;}
		</style>
	
	</head>
	<body>
		<div id="a">1</div>
		<div class="a">2</div>
		<div>3</div>
		<div>4</div>
		<p>1</p>
		<p class="a">2</p>
		<p id="a">3</p>
		<input type="text" />
		<input type="password" />
	</body>
</html>
